Multiple input multiple output Chinese character antenna device

Abstract

The present application relates to a kind of multiple-input multiple-output Chinese character antenna device, belong to wireless communication radio frequency antenna technical field.The device includes first character type radiating patch, second character type radiating patch, first parasitic metal patch, second parasitic metal patch, several feed probes, ground reflector plate and dielectric substrate;The overall physical size of first character type radiating patch and second character type radiating patch is similar, and the external contour character type topology is not mutually different;The interlayer electromagnetic coupling between first character type radiating patch and second character type radiating patch and first parasitic metal patch and second parasitic metal patch generates multiple-order resonance;Several feed probes are independently fed to first character type radiating patch and second character type radiating patch.The present application solves the problem that existing MIMO antenna relies on additional decoupling structure.

Description

Technical Field

[0001] This invention relates to the field of wireless communication radio frequency antenna technology, and in particular to a multi-input multi-output Chinese character antenna device, which is a product of the integration of Chinese culture into communication technology innovation. Background Technology

[0002] With Wi The Fi 7 communication system is evolving towards multi-band collaboration and multi-link aggregation in 2.4GHz, 5GHz, and 6GHz. Terminal devices are required to provide wideband coverage and high gain for antennas. At the same time, multiple-input multiple-output (MIMO) antennas need to achieve low port coupling and envelope correlation coefficients within a limited physical space.

[0003] Most existing MIMO patch antennas use antenna elements with identical structure and size to form an array. The surface current distribution and radiated electric field vector of each element are highly similar, and the near-field superposition effect between elements is strong, resulting in severe port coupling and high signal correlation, which degrades the MIMO diversity performance. To improve port isolation, existing technologies generally use auxiliary decoupling structures such as decoupling networks, defective ground structures (DGS), electromagnetic bandgap (EBG), and isolation barriers. However, these solutions increase PCB footprint, increase manufacturing costs, introduce additional insertion loss, and are prone to radiation pattern distortion.

[0004] Meanwhile, the frequency modulation mechanism of traditional multi-band MIMO antennas relies entirely on the physical size differences of antenna elements: by significantly increasing the difference in the length and width of the patch, separate resonance matching of low-frequency and high-frequency bands is achieved. However, this method has a fatal flaw: excessive size differences lead to severe imbalances in the radiation gain and impedance characteristics of the dual elements, poor array consistency, and large size differences cannot be adapted to the layout of compact and miniaturized devices, making it difficult to simultaneously achieve Wi-Fi connectivity. Fi 7 requires three-band collaborative operation.

[0005] On the other hand, existing irregularly shaped and Chinese character-shaped antennas are mostly single-radiating element configurations. Irregularly shaped patches with significant size differences make it difficult to simultaneously achieve multi-band resonant matching at 2.4GHz, 5GHz, and 6GHz. Increasing the element spacing to suppress mutual coupling increases the overall antenna size; decreasing the element spacing degrades isolation performance. Without parasitic resonant structures, problems such as poor impedance matching across the entire frequency band and insufficient gain consistency also arise, making it difficult to meet Wi-Fi requirements. Fi 7 multi-link aggregation meets the transmission requirements of multi-band concurrency, high throughput, and low latency. Summary of the Invention

[0006] This invention provides a multi-input multi-output (MIMO) Chinese character antenna device, which solves the problems of existing MIMO antennas that require additional decoupling structures to achieve port isolation, poor consistency of traditional-sized FM antenna arrays, and inability to adapt to Wi-Fi. Fi 7 technical problem of multi-band cooperative operation.

[0007] To achieve the above objective, the present application provides a multiple-input multiple-output Chinese character antenna device. The device includes a first font-type radiation patch, a second font-type radiation patch, a first parasitic metal patch, a second parasitic metal patch, a plurality of feeding probes, a ground reflecting plate and a dielectric substrate; the first font-type radiation patch and the second font-type radiation patch are connected to the upper surface of the dielectric substrate, the first parasitic metal patch and the second parasitic metal patch are connected to the lower surface of the dielectric substrate, the feeding probes are connected to the upper surface of the ground reflecting plate, and the ground reflecting plate is arranged in parallel opposite to the dielectric substrate; the overall physical dimensions of the first font-type radiation patch and the second font-type radiation patch are similar, and the outer contour font topologies are different from each other; multi-order resonance is generated by interlayer electromagnetic coupling between the first font-type radiation patch, the second font-type radiation patch, the first parasitic metal patch and the second parasitic metal patch; the plurality of feeding probes independently feed the first font-type radiation patch and the second font-type radiation patch.

[0008] The first font-type radiation patch and the second font-type radiation patch of the present invention respectively adopt clerical script "Xue" and "Yuan" font-type radiation patches with approximate dimensions and completely differentiated font contours. The physical dimensions of the two units are almost the same, but the topological contours, edge structures and current paths are completely different: the differentiated font structure makes the surface current vector distribution of the two units dislocated and directionally offset, greatly reduces the coupling overlap integral of the electric field and the current, and the coupling power is significantly attenuated; the differentiated current distribution naturally suppresses the near-field coupling of the units, so that the array can achieve high port isolation without any external decoupling structure under a compact spacing, and fundamentally solves the technical pain point that traditional MIMO antennas rely on additional decoupling structures from the mechanism. The present invention abandons the traditional "size frequency modulation" logic, and adopts an innovative design with highly consistent dimensions and differentiated font topologies: the difference between the overall length and width dimensions of the "Xue" font patch and the "Yuan" font patch is less than 3mm, and the unit volume and radiation area are basically the same, ensuring that the gain and impedance characteristics of the dual-port antenna are highly consistent, and the array radiation performance is balanced; at the same time, the differentiated Chinese character hollow topology and edge contour structure change the resonance path and equivalent electromagnetic wavelength of electromagnetic wave radiation, so that the two groups of patches of the same size spontaneously generate differentiated inherent resonant frequencies: the "Xue" font patch is adapted to 5-7.2GHz low-frequency resonance, and the "Yuan" font patch is adapted to 2.4GHz high-frequency resonance, perfectly covering full operating frequency band; this design breaks through the technical limitation of the traditional antenna that "the size determines the frequency band". Under the premise of not changing the unit size, not sacrificing the array consistency, and not increasing the antenna volume, it achieves accurate matching of three frequency bands, and thoroughly solves the problems of poor high and low frequency adaptation and unbalanced unit performance of traditional size-tunable antennas. In the present invention, the first font-shaped radiation patch and the second font-shaped radiation patch with similar sizes and different outlines form a two-unit MIMO array, which relies on the special-shaped outline to construct differentiated surface current paths and spatial radiation fields, and can weaken the near-field coupling of units without adding an external decoupling network, defective ground structure, electromagnetic band gap structure or isolation fence, realize pattern diversity, and give consideration to antenna miniaturization, port isolation and MIMO diversity performance; the back of the first font-shaped radiation patch and the second font-shaped radiation patch are respectively configured with mutually independent first parasitic metal patch and second parasitic metal patch, and interlayer electromagnetic coupling occurs between the font-shaped radiation patches and the parasitic metal patches, which excites multi-order resonance, expands the 2.4GHz, 5GHz, and 6GHz operating bandwidths, and improves the dual-port impedance matching. The induced current on the parasitic metal patch can perform reverse compensation for the scattered field at the edge of the special-shaped radiation patch, further reduce the mutual coupling in the full frequency band, and balance the radiation gain in the high and low frequency bands; two sets of independent L-shaped inclined feeding probes are coordinately tuned with the parasitic metal patch through the feeding position and the inclination angle, so as to realize synchronous impedance matching of three frequency bands; the grounding reflector plate, together with the font-shaped radiation patches and the parasitic metal patches, forms a multi-layer coupled radiation structure, which converges radiation energy, suppresses back radiation, and obtains stable unidirectional directional radiation characteristics. Brief Description of the Drawings

[0009] Figure 1 is a top view of the multiple-input multiple-output Chinese character antenna device provided according to the embodiment of the present application; Figure 2 is a side view of the multiple-input multiple-output Chinese character antenna device provided according to the embodiment of the present application; Figure 3 is the curve of the antenna reflection coefficients S11 and S22 varying with frequency provided according to the embodiment of the present application; Figure 4 is the mutual coupling (S21) curve of the "Xue" and "Yuan" font-shaped patch antennas provided according to the embodiment of the present application; Figure 5 is the frequency curve of the array envelope correlation coefficient ECC at different spacings provided according to the embodiment of the present application; Figure 6 is the peak gain curve of three frequency band ports under separate / combined excitation provided according to the embodiment of the present application; Figure 7 is the three-dimensional radiation pattern of the 2.4GHz single-unit "Yuan" font-shaped radiation patch antenna provided according to the embodiment of the present application; Figure 8The three-dimensional radiation pattern of the 2.4GHz "academy" shaped radiating patch antenna provided according to an embodiment of this application; Figure 9 The three-dimensional radiation pattern of the 5.0 GHz "academy" shaped radiating patch antenna provided according to an embodiment of this application; Figure 10 The three-dimensional radiation pattern of the 6.0 GHz "academy" shaped radiating patch antenna provided in the embodiments of this application. Detailed Implementation

[0010] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0011] Traditional MIMO antenna arrays use isomorphic patch elements, where the surface current vectors of two elements are highly consistent, resulting in high coupling energy between elements and severe mutual interference. The energy integral formula for element coupling is:

[0012] in, For coupling power, The near-field electric field radiated by element 1. For the surface induced current of unit 2, This refers to the area of ​​the radiating patch. In traditional antennas with identical outlines and dimensions, the current paths and current vector directions of the two elements almost coincide. The near-field electric field radiated by element 1... Surface induced current of unit 2 Highly positively correlated, coupling power The values ​​are extremely large, and the ports are severely coupled. Therefore, it is necessary to add additional structures such as DGS, EBG, and decoupling networks to consume coupling energy and block near-field interference.

[0013] Traditional multi-band MIMO antennas rely entirely on their physical size for resonant frequency modulation, following a simple rule that larger sizes result in lower resonant frequencies and smaller sizes in higher resonant frequencies. This approach requires increasing the size difference between the two elements to achieve frequency band separation at 2.4 GHz (low frequency) and 5 / 6 GHz (high frequency). However, this size difference leads to inconsistencies in radiation efficiency, gain, and impedance matching between the two elements, resulting in poor array balance, high ECC values, and hindering miniaturized integration of the device.

[0014] Example 1 like Figure 1 and Figure 2As shown, the present embodiment provides a multiple-input multiple-output Chinese character antenna apparatus, the apparatus comprising a first font-shaped radiation patch 101, a second font-shaped radiation patch 102, a first parasitic metal patch 201, a second parasitic metal patch 202, a plurality of feeding probes 3, a grounding reflection plate 4, and a dielectric substrate 5; the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 are connected to the upper surface of the dielectric substrate 5, the first parasitic metal patch 201 and the second parasitic metal patch 202 are connected to the lower surface of the dielectric substrate 5, the feeding probes 3 are connected to the upper surface of the grounding reflection plate 4, and the grounding reflection plate 4 is arranged in parallel opposite to the dielectric substrate 5; the overall physical dimensions of the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 are similar, and the outer contour font topologies are different from each other; multi-order resonance is generated by interlayer electromagnetic coupling between the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 and the first parasitic metal patch 201 and the second parasitic metal patch 202; the plurality of feeding probes 3 independently feed the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102.

[0015] Embodiment 2 This embodiment is implemented based on Embodiment 1.

[0016] Further, the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 are printed on the upper surface of the dielectric substrate 5, and the first parasitic metal patch 201 and the second parasitic metal patch 202 are printed on the lower surface of the dielectric substrate 5.

[0017] Further, the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 are of Chinese character structure; wherein the first font-shaped radiation patch 101 covers the 5.15-7.125 GHz frequency band, and the second font-shaped radiation patch 102 covers the 2.4 GHz frequency band.

[0018] Further, the first font-shaped radiation patch 101 is a "Xue" (study) font patch, and the second font-shaped radiation patch 102 is a "Yuan" (institute) font patch; The long sides of the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 are the maximum long sides of the font contour, with a dimension of 48.9-51.2 mm, and the short sides have a dimension of 33.1-33.2 mm; The distance between the center points of the first font-shaped radiation patch 101 and the second font-shaped radiation patch 102 is 61 mm; The first parasitic metal patch 201 and the second parasitic metal patch 202 are respectively rectangular copper foils correspondingly arranged on the back surfaces of the "Xue" font patch and the "Yuan" font patch.

[0019] In this embodiment, the topological difference of special-shaped characters with the same size enables the two units to spontaneously form frequency band division: the "Xue" character-shaped patch mainly operates in the high frequency bands of 5GHz and 6GHz, and the "Yuan" character-shaped patch mainly operates in the low frequency band of 2.4GHz, which perfectly covers all working frequency bands of Wi-Fi 7, and solves the dual defects of traditional antennas of the same size that cannot resonate in multiple frequency bands and antennas of different sizes that have unbalanced performance.

[0020] In this embodiment, as shown in Table 1, the dimension of the "Xue" character-shaped patch is , and the dimension of the "Yuan" character-shaped patch is ; the center-to-center distance between the "Xue" character-shaped patch and the "Yuan" character-shaped patch is 61mm. This embodiment adopts an innovative structure with the same size and different character shapes, which is completely different from the traditional antenna solution that relies on size difference to adjust the frequency. The two-unit structure has a highly unified volume, which ensures the overall consistency of the antenna array. At the same time, relying on the topological difference of the character shapes, independent resonance in multiple frequency bands of 2.4GHz and 5.15-7.125GHz is realized, which accurately matches the full-band working requirements of Wi-Fi 7. The special-shaped contour brings natural radiation pattern diversity, and relies on its own differentiated current distribution to suppress the near-field coupling of the units, without additional isolation devices, and without relying on increasing the unit spacing to reduce the coupling. A first parasitic metal patch 201 and a second parasitic metal patch 202 are added on the back side to excite multi-order resonance to widen the bandwidth of the three frequency bands of 2.4 / 5 / 6GHz, reversely cancel the edge scattering field of the units, further reduce mutual coupling, and balance the radiation gain of the full frequency band; the parasitic metal patches are printed only using the area on the back side of the dielectric substrate 5, which does not increase the overall volume of the antenna, has low processing cost, and effectively improves the antenna bandwidth margin and high-frequency isolation.

[0021] Table 1 Physical parameter dimensions of antenna (unit: mm)

[0022] Further, the mutual impedance between the first character-shaped radiation patch 101 and the second character-shaped radiation patch 102 is:

[0023] wherein, is the unit mutual impedance; is the electric field generated by the first character-shaped radiation patch 101 near the second character-shaped radiation patch 102; is the induced current on the metal surface of the second character-shaped radiation patch 102; is the volume domain surrounding the second character-shaped radiation patch 102.

[0024] In this embodiment, relying on the differentiated current distribution of the special-shaped Chinese character contour, the strong coupling association between the electric field and current of traditional antennas with identical units is broken, and the mutual impedance is greatly reduced ; combined with the scattering parameter relationship (wherein, is the system characteristic impedance), the native suppression of port mutual coupling is realized. This decoupling mechanism is completely implemented relying on the antenna's own structure, without any additional auxiliary decoupling circuits, DGS, or EBG structures, fundamentally solving the industry pain point that existing MIMO antennas rely on additional decoupling structures. In this embodiment, two special-shaped radiation patches are compactly arranged side by side above the ground reflection plate 4, achieving mutual coupling ≤ in the full 2.4 / 5 / 6GHz frequency band under the compact array condition, taking into account both equipment miniaturization and high isolation specifications, without relying on a large element spacing to obtain isolation performance.

[0025] Further, the first parasitic metal patch 201 and the second parasitic metal patch 202 are independent of each other and not connected, forming an interlayer electromagnetic coupling structure with the upper first zigzag radiation patch 101 and second zigzag radiation patch 102.

[0026] Further, the first parasitic metal patch 201 and the second parasitic metal patch 202 include a parasitic long side 2001 and a parasitic short side 2002, and the dimension of the parasitic long side 2001 is , and the dimension of the parasitic short side 2002 is . In this embodiment, the coordinates of the center of the first parasitic metal patch 201 are , the dimension is , which is correspondingly arranged on the back of the "xue" shaped patch; the coordinates of the center of the second parasitic metal patch 202 are , the dimension is , which is correspondingly arranged on the back of the "yuan" shaped patch; wherein the origin of the coordinates is the symmetry center of the dielectric substrate 5, the long side of the dielectric substrate 5 is taken as the x-axis, and the short side of the dielectric substrate 5 is taken as the y-axis.

[0027] Further, the dielectric substrate 5 is an R04003C rigid dielectric plate, whose dimension is , the relative permittivity is , and the loss tangent is . In this embodiment, the thickness of the R04003C rigid dielectric plate is 0.5mm.

[0028] Further, the feed probe 3 is an L-shaped feed probe, whose vertical section dimension is , and the horizontal section dimension is . In this embodiment, as shown in Table 1, the vertical section dimension of the feed probe 3 is , , and the horizontal section dimension is , .

[0029] Further, the inclination angle of the horizontal section of the feed probe 3 is In this embodiment, the probe tilt angles of the horizontal segment are respectively... , The feed coordinates of the feed probe 3 are: and The dual L-shaped tilted independent power supply probe structure, power supply point and tilt angle, together with the first parasitic metal patch 201 and the second parasitic metal patch 202, are coordinated to achieve synchronous broadband impedance matching of Wi-Fi 7 three bands.

[0030] Furthermore, the grounding reflector 4 has a length of 130-150mm and a width of 80mm.

[0031] Furthermore, the vertical distance between the grounding reflector 4 and the dielectric substrate 5 is 13mm; the grounding reflector 4, together with the first parasitic metal patch 201 and the second parasitic metal patch 202, forms a double-layer coupled directional radiation structure, thereby improving the antenna gain.

[0032] In this embodiment, a three-layer coupled directional radiation structure consisting of a character-shaped radiating patch, a parasitic metal patch, and a grounding reflector balances the gain across high and low frequency bands, achieving unidirectional directional radiation across the entire frequency band.

[0033] Example 3 This embodiment demonstrates the performance effect of Embodiment 1 or Embodiment 2. By combining the core design mechanism of this invention with a benchmark analysis of traditional baseline schemes, the technical advantages of this invention are clarified.

[0034] like Figure 3 As shown, this invention is based on a core design of same-size heterogeneous topology frequency modulation + interlayer parasitic coupling, achieving deep resonance and broadband matching at the dual-port in the 2.4GHz, 5GHz, and 6GHz frequency bands. The minimum S11 value in the 2.4GHz band is... , Effective bandwidth 84.0MHz; minimum S22 value in 5GHz band , Effective bandwidth 700.0MHz; minimum S22 value in 6GHz band , Effective bandwidth is 1151.5MHz. Compared with traditional baseline solutions: traditional MIMO antennas either use the same size and unit structure, which cannot achieve multi-band resonance and has a serious lack of high-frequency bandwidth; or they use large-size differential unit frequency modulation, resulting in unbalanced dual-port matching performance and poor resonance depth. However, this invention achieves multi-band resonance of the same size through word-shaped topology differences, and with the multi-order coupling of the first parasitic metal patch 201 and the second parasitic metal patch 202, the impedance matching of the three bands is optimized simultaneously, which solves the defects of narrow bandwidth and poor frequency band adaptability of traditional solutions.

[0035] like Figure 4As shown, this invention relies on the differentiated current decoupling mechanism of irregularly shaped units to achieve full-band mutual coupling S21≤ without any DGS, EBG, or decoupling network. The 6GHz high-frequency isolation is improved compared to traditional non-decoupling structures. Traditional baseline schemes, due to the use of identical structural units, exhibit high surface current coupling, and without additional decoupling structures, mutual coupling is generally higher than [a certain value]. This approach is completely inadequate to meet the requirements of MIMO systems; various decoupling structures must be added to improve isolation, but this leads to problems such as increased losses and pattern distortion. This invention relies on the inherent decoupling capability of the structure to achieve isolation performance far exceeding that of traditional decoupling solutions without adding any additional decoupling devices, while avoiding the drawbacks of adding structures.

[0036] like Figure 5 As shown, the ECC value of this invention is <0.05 across the entire frequency band, and as low as 0.01 at most frequencies, far exceeding the common standard of 0.1 for MIMO systems. The core reason for this is that the differentiated radiation fields of the irregularly shaped Chinese character units achieve natural pattern diversity. Traditional MIMO antennas with the same unit have highly overlapping radiation patterns, and their ECC values ​​are generally greater than 0.2, resulting in extremely poor diversity performance. Traditional frequency-modulated antennas with different sizes suffer from large ECC fluctuations and poor stability due to imbalanced unit performance. This invention's design, with the same size but different topology, achieves ultimate diversity performance while ensuring balanced unit performance.

[0037] like Figures 6-10 As shown, this invention achieves a stable peak gain of 5 dBi at 2.4 GHz and a stable high-frequency gain of 7-9 dBi at 5.5 GHz and 6.5 GHz, with a smooth gain curve across the entire frequency band and a stable, distortion-free radiated beam. Traditional MIMO antennas with additional decoupling structures introduce insertion loss and interference radiation fields, leading to gain attenuation and pattern distortion; traditional FM antennas also exhibit poor high- and low-frequency gain consistency. This invention, without additional loss structures and combined with a three-layer coupled radiation structure, achieves high-gain, high-stability unidirectional radiation across the entire frequency band; the antenna adaptability of this invention... Multi-link aggregation (MLO) working mode: balanced radio frequency performance across three frequency bands, supports concurrent transmission of 2.4G / 5G / 6G multi-link aggregation, improves throughput, reduces latency, and ensures seamless link switching, making it suitable for high-density wireless access scenarios on campuses.

[0038] In summary, this invention abandons the traditional paradigm of "size-based frequency modulation + additional decoupling structure," and achieves high-performance MIMO through topologically differentiated frequency modulation of irregularly shaped Chinese characters of the same size + native current decoupling mechanism. It eliminates the need for external decoupling structures such as decoupling networks, DGS, and EBG, relying solely on parasitic copper foil printed on the back of the substrate. The array structure is compact and suitable for campus environments. Wireless APs are being mass-produced.

[0039] The present invention has the following advantages or beneficial effects: 1. Innovative Core Mechanism, Completely Eliminating Dependence on Additional Decoupling: Traditional MIMO antennas with strong current coupling within the same element require external structures such as DGS, EBG, and decoupling networks for isolation. This invention employs irregularly shaped Chinese character-based differentiated radiating elements, utilizing the inherent mechanism of surface current vector misalignment and coupling integral attenuation between dual elements to suppress mutual coupling between elements at the antenna radiation source. This eliminates the need for any additional decoupling devices, significantly simplifying the antenna structure, reducing insertion loss, and preventing radiation pattern distortion.

[0040] 2. Breaking through the limitations of traditional frequency modulation, achieving precise three-band adaptation within the same size: This invention breaks the industry's inherent understanding that "antenna size determines the resonant frequency band." Traditional solutions must rely on size differences to achieve multi-band matching, resulting in unbalanced unit performance and large size. This invention uses "academy" and "college" patches with consistent size and differentiated topology. Utilizing the differences in the hollow topology and edge structure, it achieves independent resonance at 2.4GHz low frequency and 5-7.2GHz high frequency, perfectly covering the entire Wi-Fi 7 frequency band while ensuring highly balanced radiation performance between the two units.

[0041] 3. Simplified structure, low cost, and low loss: It eliminates additional structures such as decoupling networks, defective grounding (DGS), electromagnetic bandgap (EBG), and isolation barriers, and only prints two parasitic metal patches on the back of the dielectric substrate, without adding isolation components; it reuses the unused area on the back of the substrate, without increasing the antenna size, reducing the PCB footprint, and reducing incremental processing costs; it avoids the insertion loss caused by additional decoupling structures, and the parasitic metal patches can also improve radiation efficiency, without causing pattern distortion caused by DGS and EBG; it does not require increasing the array spacing to achieve isolation, resulting in a smaller overall integrated size.

[0042] 4. Excellent full-band isolation and diversity performance: Parasitic metal patch reverse cancellation unit near-field scattering, 2.4 / 5 / 6GHz full-band mutual coupling stability is superior to The 6GHz high-frequency isolation is improved by an additional 3-5dB; the envelope correlation coefficient (ECC) can be as low as 0.01, which is far below the 0.1 general threshold of MIMO systems; two irregularly shaped radiating patches with similar size and different contours naturally achieve pattern diversity, which significantly improves anti-interference capability and channel capacity compared with the same unit array, while maintaining high isolation in a compact layout.

[0043] 5. Significantly expanded bandwidth across three frequency bands and excellent matching performance: Utilizing interlayer coupling between irregularly shaped patches and parasitic patches to excite multi-order resonances, optimizing… Impedance depth in core frequency bands: S11 resonance depth is significantly improved in the 2.4GHz band, bandwidth in the 5GHz and 6GHz bands is greatly expanded, and dual-port resonant synchronization is optimized to meet [the requirements]. Practical transmission requirements for engineering applications.

[0044] 6. Smooth and stable gain, strong unidirectional directional radiation capability: The parasitic metal patch cooperates with the grounding reflector to converge electromagnetic waves and compensate for high-frequency loss; the gain at 2.4GHz is stable at 5dBi, The high-frequency gain is maintained at 7-9dBi with a smooth gain curve; the grounding reflector and the parasitic patch work together to achieve unidirectional directional radiation, featuring strong signal coverage capability, which is suitable for directional deployment scenarios of campus routers and wireless APs.

[0045] 7. Compact size, integrated appearance with campus identifier: Two special-shaped patches are arranged in parallel compactly without requiring a large reserved isolation distance; the two character-shaped patches have similar volumes, presenting a coordinated front visual effect; the parasitic metal patch is arranged on the back of the substrate without damaging the visual effect of the Chinese characters "学" (study) and "院" (college) on the front, featuring the characteristics of a campus identifier, and can be integrated with the appearance of campus Wi Fi equipment, taking into account both radio frequency performance and appearance recognizability.

[0046] 8. Full-planar and low profile, convenient for mass integration: The overall printed planar structure allows the special-shaped radiating patch and the parasitic metal patch to be synchronously printed and formed; the antenna profile is determined by the distance between the dielectric substrate and the grounding reflector, featuring a low profile height, which is convenient for built-in integration inside terminals, wireless APs, and campus routers.

[0047] 9. Perfectly adapted to Wi-Fi 7 Multi-Link Aggregation (MLO): The radio frequency performance of the dual ports is balanced and stable, which can give full play to the core advantages of multi-link aggregation, realize multi-band concurrent, high-throughput, low-latency and non-interrupted transmission, and is suitable for high-density campus scenarios and various civil wireless communication scenarios.

[0048] The above are the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principle described in the present application, and these improvements and modifications shall also be regarded as falling within the protection scope of the present application.

Claims

1. A multi-input multi-output (MIMO) Chinese character antenna device, characterized in that, The apparatus includes a first font-shaped radiating patch (101), a second font-shaped radiating patch (102), a first parasitic metal patch (201), a second parasitic metal patch (202), a plurality of feeding probes (3), a ground reflection plate (4), and a dielectric substrate (5); the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) are connected to the upper surface of the dielectric substrate (5), the first parasitic metal patch (201) and the second parasitic metal patch (202) are connected to the lower surface of the dielectric substrate (5), the feeding probes (3) are connected to the upper surface of the ground reflection plate (4), and the ground reflection plate (4) is arranged parallel and opposite to the dielectric substrate (5); the overall physical dimensions of the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) are similar, and the outer contour font topologies are different from each other; interlayer electromagnetic coupling between the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) and the first parasitic metal patch (201) and the second parasitic metal patch (202) generates multi-order resonance; the plurality of feeding probes (3) independently feed the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102).

2. The multi-input multi-output Chinese character antenna device according to claim 1, characterized in that, The first parasitic metal patch (201) and the second parasitic metal patch (202) do not affect the cultural significance and aesthetic appeal of the font-shaped radiating patches; The first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) are printed on the upper surface of the dielectric substrate (5), and the first parasitic metal patch (201) and the second parasitic metal patch (202) are printed on the lower surface of the dielectric substrate (5).

3. The multi-input multi-output Chinese character antenna device according to claim 1 or 2, characterized in that, The first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) are of Chinese character structure; wherein the first font-shaped radiating patch (101) covers the 5.15-7.125GHz frequency band, and the second font-shaped radiating patch (102) covers the 2.4GHz frequency band.

4. The multi-input multi-output Chinese character antenna device according to claim 3, characterized in that, The first font-shaped radiating patch (101) is a clerical script "Xue" font-shaped patch, and the second font-shaped radiating patch (102) is a clerical script "Yuan" font-shaped patch; The long sides of the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) are the maximum long sides of the character outline, with a dimension of 48.9-51.2mm, and the short sides have a dimension of 33.1-33.2mm; The distance between the center points of the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) is 61mm; The first parasitic metal patch (201) and the second parasitic metal patch (202) are respectively rectangular copper foils correspondingly arranged on the back of the "Xue" font-shaped patch and the "Yuan" font-shaped patch.

5. The multi-input multi-output Chinese character antenna device according to claim 1 or 4, characterized in that, The mutual impedance between the first font-shaped radiating patch (101) and the second font-shaped radiating patch (102) is: in, For unit mutual impedance; The electric field generated by the first shaped radiating patch (101) near the second shaped radiating patch (102); Induced current on the metal surface of the second-shaped radiating patch (102); The volume domain surrounding the second shaped radiating patch (102).

6. The multi-input multi-output Chinese character antenna device according to claim 5, characterized in that, The first parasitic metal patch (201) and the second parasitic metal patch (202) are independent of each other and are not connected.

7. The multi-input multi-output Chinese character antenna device according to claim 6, characterized in that, The first parasitic metal patch (201) and the second parasitic metal patch (202) include a parasitic long side (2001) and a parasitic short side (2002), wherein the size of the parasitic long side (2001) is... The dimensions of the parasitic short side (2002) are: .

8. The multi-input multi-output Chinese character antenna device according to claim 1, characterized in that, The feed probe (3) is an L-shaped feed probe, and the vertical section dimension is: The horizontal segment dimensions are .

9. The multi-input multi-output Chinese character antenna device according to claim 8, characterized in that, The horizontal section of the feed probe (3) is tilted at an angle of 1. .

10. The multi-input multi-output Chinese character antenna device according to claim 1, characterized in that, The plate length of the ground reflection plate (4) is 130-150mm.

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